Hypothesis Testing

A biologist discovers a colony of a previously unknown type of bird nesting in a cave. Out of the 16 chicks which hatch during his period of investigation, 13 are female. Test at the 5% significance level whether this supports the view that that the sex ratio for the chicks differs from 1.
Im really stuck i think ive developed the p:H1 and p:H0 but after that i am a bit stuck any help is much appreciated thankyou

I would test that the proportion of females is .5 versus not
Since n is small you cannot approximate with a normal and you will need to use the binomial distribution.
You can obtain the p-value with x=13
And n=16, p=.5.